/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2006, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.classfile.impl;

import java.io.File;
import java.io.IOException;

import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.classfile.IAnalysisCache;
import edu.umd.cs.findbugs.classfile.IClassFactory;
import edu.umd.cs.findbugs.classfile.IClassPath;
import edu.umd.cs.findbugs.classfile.IClassPathBuilder;
import edu.umd.cs.findbugs.classfile.ICodeBase;
import edu.umd.cs.findbugs.classfile.ICodeBaseLocator;
import edu.umd.cs.findbugs.classfile.IErrorLogger;
import edu.umd.cs.findbugs.classfile.IScannableCodeBase;
import edu.umd.cs.findbugs.classfile.ResourceNotFoundException;

/**
 * Factory to create codebase/classpath/classfile objects. 
 * 
 * @author David Hovemeyer
 */
public class ClassFactory implements IClassFactory {
	private static IClassFactory theInstance = new ClassFactory();

	private ClassFactory() {
	}

	public static IClassFactory instance() {
		return theInstance;
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.impl.IClassFactory#createClassPath()
	 */
	public IClassPath createClassPath() {
		return new ClassPathImpl();
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.IClassFactory#createClassPathBuilder(edu.umd.cs.findbugs.classfile.IErrorLogger)
	 */
	public IClassPathBuilder createClassPathBuilder(IErrorLogger errorLogger) {
		return new ClassPathBuilder(this, errorLogger);
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.impl.IClassFactory#createFilesystemCodeBaseLocator(java.lang.String)
	 */
	public ICodeBaseLocator createFilesystemCodeBaseLocator(String pathName) {
		// Attempt to canonicalize the pathname.
		// It's not fatal if we can't.
		try {
			pathName = new File(pathName).getCanonicalPath();
		} catch (IOException e) {
			// Ignore
		}

		return new FilesystemCodeBaseLocator(pathName);
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.IClassFactory#createNestedArchiveCodeBaseLocator(edu.umd.cs.findbugs.classfile.ICodeBase, java.lang.String)
	 */
	public ICodeBaseLocator createNestedArchiveCodeBaseLocator(ICodeBase parentCodeBase, String path) {
		return new NestedZipFileCodeBaseLocator(parentCodeBase, path);
	}

	static IScannableCodeBase createFilesystemCodeBase(FilesystemCodeBaseLocator codeBaseLocator) throws IOException {
		String fileName = codeBaseLocator.getPathName();

		File file = new File(fileName);

		if (file.isDirectory()) {
			return new DirectoryCodeBase(codeBaseLocator, file);
		} else if (fileName.endsWith(".class")) {
			return new SingleFileCodeBase(codeBaseLocator, fileName);
		} else {
		    return ZipCodeBaseFactory.makeZipCodeBase(codeBaseLocator, file);
		}
	}

	static IScannableCodeBase createNestedZipFileCodeBase(
			NestedZipFileCodeBaseLocator codeBaseLocator)
			throws ResourceNotFoundException, IOException {
		return new NestedZipFileCodeBase(codeBaseLocator);
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.IClassFactory#createAnalysisCache(edu.umd.cs.findbugs.classfile.IClassPath)
	 */
	public IAnalysisCache createAnalysisCache(IClassPath classPath, BugReporter errorLogger) {
		IAnalysisCache analysisCache = new AnalysisCache(classPath, errorLogger);
		return analysisCache;
	}
}
